diff options
Diffstat (limited to 'drivers/staging/zcache/debug.c')
| -rw-r--r-- | drivers/staging/zcache/debug.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/drivers/staging/zcache/debug.c b/drivers/staging/zcache/debug.c new file mode 100644 index 000000000000..daa26919b886 --- /dev/null +++ b/drivers/staging/zcache/debug.c @@ -0,0 +1,107 @@ +#include <linux/atomic.h> +#include "debug.h" + +#ifdef CONFIG_ZCACHE_DEBUG +#include <linux/debugfs.h> + +ssize_t zcache_obj_count; +ssize_t zcache_obj_count_max; +ssize_t zcache_objnode_count; +ssize_t zcache_objnode_count_max; +u64 zcache_eph_zbytes; +u64 zcache_eph_zbytes_max; +u64 zcache_pers_zbytes_max; +ssize_t zcache_eph_pageframes_max; +ssize_t zcache_pers_pageframes_max; +ssize_t zcache_pageframes_alloced; +ssize_t zcache_pageframes_freed; +ssize_t zcache_eph_zpages; +ssize_t zcache_eph_zpages_max; +ssize_t zcache_pers_zpages_max; +ssize_t zcache_flush_total; +ssize_t zcache_flush_found; +ssize_t zcache_flobj_total; +ssize_t zcache_flobj_found; +ssize_t zcache_failed_eph_puts; +ssize_t zcache_failed_pers_puts; +ssize_t zcache_failed_getfreepages; +ssize_t zcache_failed_alloc; +ssize_t zcache_put_to_flush; +ssize_t zcache_compress_poor; +ssize_t zcache_mean_compress_poor; +ssize_t zcache_eph_ate_tail; +ssize_t zcache_eph_ate_tail_failed; +ssize_t zcache_pers_ate_eph; +ssize_t zcache_pers_ate_eph_failed; +ssize_t zcache_evicted_eph_zpages; +ssize_t zcache_evicted_eph_pageframes; +ssize_t zcache_zero_filled_pages; +ssize_t zcache_zero_filled_pages_max; + +#define ATTR(x) { .name = #x, .val = &zcache_##x, } +static struct debug_entry { + const char *name; + ssize_t *val; +} attrs[] = { + ATTR(obj_count), ATTR(obj_count_max), + ATTR(objnode_count), ATTR(objnode_count_max), + ATTR(flush_total), ATTR(flush_found), + ATTR(flobj_total), ATTR(flobj_found), + ATTR(failed_eph_puts), ATTR(failed_pers_puts), + ATTR(failed_getfreepages), ATTR(failed_alloc), + ATTR(put_to_flush), + ATTR(compress_poor), ATTR(mean_compress_poor), + ATTR(eph_ate_tail), ATTR(eph_ate_tail_failed), + ATTR(pers_ate_eph), ATTR(pers_ate_eph_failed), + ATTR(evicted_eph_zpages), ATTR(evicted_eph_pageframes), + ATTR(eph_pageframes), ATTR(eph_pageframes_max), + ATTR(pers_pageframes), ATTR(pers_pageframes_max), + ATTR(eph_zpages), ATTR(eph_zpages_max), + ATTR(pers_zpages), ATTR(pers_zpages_max), + ATTR(last_active_file_pageframes), + ATTR(last_inactive_file_pageframes), + ATTR(last_active_anon_pageframes), + ATTR(last_inactive_anon_pageframes), + ATTR(eph_nonactive_puts_ignored), + ATTR(pers_nonactive_puts_ignored), + ATTR(zero_filled_pages), +#ifdef CONFIG_ZCACHE_WRITEBACK + ATTR(outstanding_writeback_pages), + ATTR(writtenback_pages), +#endif +}; +#undef ATTR +int zcache_debugfs_init(void) +{ + unsigned int i; + struct dentry *root = debugfs_create_dir("zcache", NULL); + if (root == NULL) + return -ENXIO; + + for (i = 0; i < ARRAY_SIZE(attrs); i++) + if (!debugfs_create_size_t(attrs[i].name, S_IRUGO, root, attrs[i].val)) + goto out; + + debugfs_create_u64("eph_zbytes", S_IRUGO, root, &zcache_eph_zbytes); + debugfs_create_u64("eph_zbytes_max", S_IRUGO, root, &zcache_eph_zbytes_max); + debugfs_create_u64("pers_zbytes", S_IRUGO, root, &zcache_pers_zbytes); + debugfs_create_u64("pers_zbytes_max", S_IRUGO, root, &zcache_pers_zbytes_max); + + return 0; +out: + return -ENODEV; +} + +/* developers can call this in case of ooms, e.g. to find memory leaks */ +void zcache_dump(void) +{ + unsigned int i; + for (i = 0; i < ARRAY_SIZE(attrs); i++) + pr_debug("zcache: %s=%zu\n", attrs[i].name, *attrs[i].val); + + pr_debug("zcache: eph_zbytes=%llu\n", (unsigned long long)zcache_eph_zbytes); + pr_debug("zcache: eph_zbytes_max=%llu\n", (unsigned long long)zcache_eph_zbytes_max); + pr_debug("zcache: pers_zbytes=%llu\n", (unsigned long long)zcache_pers_zbytes); + pr_debug("zcache: pers_zbytes_max=%llu\n", (unsigned long long)zcache_pers_zbytes_max); +} +#endif |